Intraindividual reaction time variability affects P300 amplitude rather than latency

Ramchurn, Anusha; De Fockert, J. W.; Mason, Luke; Darling, Stephen and Bunce, David. 2014. Intraindividual reaction time variability affects P300 amplitude rather than latency. Frontiers in Human Neuroscience, 8, 557. ISSN 1662-5161 [Article]

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Abstract or Description

The neural correlates of intraindividual response variability were investigated in a serial choice reaction time (CRT) task. Reaction times (RTs) from the faster and slower portions of the RT distribution for the task were separately aggregated and associated P300 event-related potentials computed. Independent behavioral measures of executive function and IQ were also recorded. Across frontal, fronto-central, central, centro-parietal and parietal scalp regions, P300 amplitudes were significantly greater for faster relative to slower behavioral responses. However, P300 peak amplitude latencies did not differ according to the speed of the behavioral RT. Importantly, controlling for select independent measures of executive function attenuated shared variance in P300 amplitude for faster and slower trials. The findings suggest that P300 amplitude rather than latency is associated with the speed of behavioral RTs, and the possibility that fluctuations in executive control underlie variability in speeded responding.

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Anusha Ramchurn conducted this study as part of doctoral research at Goldsmiths, University of London, and was supported by the Economic and Social Research Council, UK. David Bunce was supported by a Leverhulme Trust Research Fellowship, UK.


intraindividual reaction time variability; Electrophysiology; EEG; P300; executive control

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29 July 2014Published
8 July 2014Accepted

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08 Jul 2014 12:04

Last Modified:

03 Aug 2021 15:03

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Yes, this version has been peer-reviewed.


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